System of electrical distribution.



No; :af/8,661.

R; s. MQLEOD.

SYSTEM F ELEUTRIGAL DSTRIBUTE.

APPLICATION FILED JULY 11,19%.

ATEHTED FEB. ll l908.

5 EHEES-SHEET 2.

we/f 'J 22352606/ -SYSTEM OP ELECTRICAL DISTRIUTION.

APPLIoA'HoN FILED JULY 11,1904.

'5 SHEETS-s111121' s.

j unrrnn sTATns ROBERT sTaFFoRD MeLEo'D,

4PAT:i3iafr` ermee.

OF MANCHESTER, ENGLAND.

SYSTEM onI ELECTRICAL DIsTRrBUTroN.

To all whom 'it may concern:

Be it known that I, ROBERT STAFFORD MCLEOD, a subject of the Kingv of Great Britain, residing in Manchester, England, have invented certain new and useful improvements in systems 4of electrical distribution for regulating the charge and discharge of storage batteries used in combination withmain enerators, of which the following is a spec' ication.

This invention relates to dynamo electric machines for regulating the charge and discharge of storage batteries; such apparatus comprises a reversible booster connected in series with the batte f acrossthe mains, a

motor for driving the ooster, and means to provideja field excitation such as to give at the booster terminals a voltage of such value and sign as maybe necessary to enable the battery to dischargev when the external load 1s greater than the normal output of the main.

generator, 'and to charge when the said load is less than thesaid-output; in this way the .booster serves tosc regulate the battery as to tend to maintain a constant main generator oultput with ajvarying load.

present invention has reference tothe.

A` mode of exciting the boosterfield, andI have illustrated'my invention in the accompanying drawings-iii which each of the figures is a diagrammaticrepresentation of the windd theirconnections to the mains, batte booster, and exciter.

e booster and exciter are in each case driven by -a motor at a fairly constant. speed. The boosterand exciter may be of the 'usual construction common to suchmaf chines, excep`t that the windings are arran ed as hereinafter described,;'the fields are pre erabl laminated.

n the case of each" of the fieldwindings shown in the drawi'n re ulatin resist- 'ances may be inserte -in `tfie wel known manner to adjust the'current in such wind` ings", and these resistances may be arranged in' series with the windings, or in arallel with', them as diverting resistances.

h ese resistances with the exception of'H are for clearness omitted from the drawings, as .their mode ofeonnection is wellknown.

In each of the figures, D is the main generator, E the-exciter, AGr the booster, N the l battery, an'd M the motor.

The booster G and the exciter E are driven l sp'eiac'ation of Letters Patent. Application Sled July 11| 1904. Serial No.v 216.132.

- Patented Feb. 1`1, 190e.

nections are fas follows The boostei` 1G and the battery N are connected in series across the mains m fed by the generator I),

booster terminals p and g equal to the differ ence of voltage between the mains and 'the battery. the one a adapted to carry a current which varies as the main current,: and the other b a current which varies as the main volta e;

exciter voltage will-thus va tial effect of these two win ings.-

effect of two voltages, that of the exciter main and batteryvoltages 'these two voltages may both be aiplied to the one winding c, as in Figures I to tude the volts lost' in the'booster armature of course increase, and in order to compensate for this loss I find it convenient to add tery, either .on the booster field as -in Figs. II 'and VI, or on the exciter field as in Figs. III and VII, or on both exciter and booster, as in Fig. IV

Ig which is equal tothe difference between that ofthe mains and that of the battery, and the'same effect would therefore be produced if, instead ofa single'winding d, two

respectively across the mains, and across the battery; .this arrangement 1s shownm Flgs.

by the motor M and the .windings and 'conthere will therefore be a voltage between the' these currents are in opposition, and t eas the diieren- As the battery current increases in magm-4 Aa fewseries turns s, in series with the bat-' The windin' ditwiubeseen has vonage 'across the en s equal to that between p and- The exciter field has two windings, A

.The booster fieldis excited by the joint" Aand that equal to the difference between the V, or theremay be`two wind--A ings, one c connected to the exciter terminals,

and one d connected to the booster terminals p and g, as in Figs. V to VII. Where the two .connections are such that the voltage -of the and g when the batlos windings (Z1 and dz were 'fit-ted, connected VIII, IX, and X, which are `views analogous winding d already described.

In a modification the windingd connected 1 across the booster terminals maybe fitted on the exciter field and its effect on the booster volts produced indirectly ,by its iniiuence on the exciter; this arrangement is shown' in Figs. XL1 XII and XIII which are analogous views to Figs. vin, ix and x, and inlwhich, as in Athe'latter figures, the winding s is shown on the booster or on the exciter respectively. Y f

When the winding d is fitted on the exciter it is so wound and connected as to have the same effect in relation to the other windings as that produced when it'is fitted on the booster in the manner described.

The'current in the coil c may be the whole -main 'current or a delinite part thereof shunted bythe divertin resistance H; and

in each case theend Z o thewi'nd Cr-0, andA the end 'n of the connection to the ooster -terminal p are arranged toAslide on contacts vprovided in the resistance H, so that 'n may be joined to the main at either endof H or at an intervening' point, and so tliatby niovin'lA more or less of H may be included as -a verting resistance.V Y

It will be seen that when thev slider. nis in the position shown in the drawings, the magnetizing' el'ect of the coil a will be proportional to the lmain 'currentfon the side of the A battery next the generatin means, but that when, as shown in dotted ines in F ig. 1V,u is moved to the contact fr (the sliderl remain'- 'ingin the position shown) the said magnetizing eiect of the coil a will be proportional to the main-current on the side of the bat# tery remote from the generating means; n can also be placedjin intermediate positions and the propotion in the coil a of .the main current may thus .be adjusted.

The windings conneetedto the booster.

terminals may be connected across the terminals p. and q of the booster as shown inA F ig. I or across the terminals p and o the el'ect being practically the same in each case.

I have shown. in Fig. IV an arrangement of the diverting resistance II which I have found convenient in practice,4 andin which the amount of the resistance 1I in the circuit maybe regulated byshort-circuiting more or less of H by means of a short-circuiting slider -t,'in Fig. IV the resistances 1,l 2 and 3,'

are sliort-circuitedso that only the resistances 4 and 5 are used to divert the current through the winding a; if t be-movedto r then the whole of I-I is used as adiverting' resistance; the resistance, 1 is usually exceedingly high so that when 't is on 1 practically the whole currentgo'es through the winding a..

The' arrangement is shown diagrammatically.

R eostats w may'befinserted in the various windings if necessary for the purposes of adjustment.

' -It is to be understood that I make no broad claim herein to theA use on a booster field ofva 'winding such as'din combination with current and voltage windings, as this. forms the subject matter of a prior United States Patent granted to me, and numbered 737,764. f

Having'now Jfully described my invention,

I declare that what I-claiin and desire toA secure by Letters Patent 1. In apparatus such as herein described,

vin combination with a main generator and a storage battery :.-a booster the armature of which is connected in series with the battery across the mains, an exciter, 'and means for driving the exciter and the booster, thesaid exciter fieldbeing magnetized by a magnetizing force proportional to the main cur- .rent and' to the main voltage, and the said booster field being magnetized by a magnetizing force `proportional to the exciter voltage and to the difference of voltage between the mains and the battery; substantially as described,

'2. In apparatus such as'licrcin described,

- in combination with a inain generator and a storage battery t--a booster the armature of which is connected in series with the battery across the mains, an exciter, and means for driving' the' exciter'and the booster, the said 4exciter field being magnetized by a magnetforce proportional to the inain current and t0 the main voltage, and the said booster field being magnetized by a inagnetizing .force proportional to the exciter voltage, to

the difference of voltage between the mains and the battery, and to the battery current; substantially as described.

w3. In apparatus such as herein described, in combination with a main generator and a storage battery :'-.a booster the armature of which is connected in series with the battery across. they mains, an exciter, and4 means for driving the exciter and the booster, Athe said exciter Iield being inagnetized by amagnetizing force proportional to the main current, to the main voltage, and to the battery current, and the said booster ield being magnetized by a magnetizing force pro iortional `to the'exciter voltage and to the ill'ercnce of voltage between the mains and-thc battery; substantially as described.

4. In apparatus such as herein described, in combination with a main generator and a storage battcryi-a booster theai'mature of whichis connected in series withthe battery 'across the -mair-is, 1an exciter, aid'firipans' for driving the exciter and the booster, the said exciter held being niagnctized by a magnetizing force proportional to the main cui-rmt,

ico

in combination with a main generator, and aY storage battery z-a booster the armature of which is connected in series with the battery across the mains, an exciter, and means for driving the exciter and the booster, the said exciter field having ashunt winding across the mains and a series winding connected to the endsof a diverting resistancein the main circuit, and the -said booster `field having a. u winding connected to the. exciter terminals and to the booster terminals; substantially as described. Y

6. In apparatus such as herein described; 1n conibinatlon w1th a maln generator and a y storage batteryzfa booster the armature of which is connected in series with a battery across the mains, an exciter, and means for driving the exciter and the booster, the said exciter fieldhaving a shunt Winding across the mains and a series Winding connected to the ends of a diverting resistance in the main circuit, and the said booster field having a winding connected4 to the exciter terminals and to the booster terminals, 'and a Winding ends of a. diverti in series vviththe battery; substantially as described.

7'. In `apparatus such as herein described,

in combination with a main generator and a storage batteryz-a booster the armature of which is connected in series with the battery across the mains, an exciter, and means for driving the exciter and the booster, lthe said exciter field having a shunt winding acrossk the mains, a series Winding connected to the circuit, and a windin in series with the battery, and the said ooster iield having a Winding connected to -the exciter terminals and to the booster terminals; substantially as described. A

8. In apparatus such as herein described, in combination with a main generator, a

. storage battery, an exciter, and a booster,-al

diverting resistance in the main circuit havresistance in the main ing contacts and'threesliders connected rel spectively to the series coil on the exciter, a

terminal of the booster and a short circuiting conductor; substantially as described.

. In testimony whereof I havehereunto set my hand in-the"'firesence of two subscribing witnesses,

ROBERT STAFFORD MCLEoD.

Witnessesf JOHN HARRY WILD, i g GEORGE ERro MASON. 

